Table 2:

Qualitative analysis of image quality: BPA versus SCA

BPAaSCAaP Value
Arterial segment
    ICA (sub)2.74 ± 0.562.42 ± 0.76.019
    ICA (unsub)2.88 ± 0.332.56 ± 0.61.002
    M1 (sub)2.60 ± 0.672.50 ± 0.58.427
    M1 (unsub)2.80 ± 0.452.62 ± 0.49.059
    M2 (sub)2.38 ± 0.752.00 ± 0.78.015
    M2 (unsub)2.62 ± 0.572.24 ± 0.69.003
    M3 (sub)2.18 ± 0.771.56 ± 0.93<.001
    M3 (unsub)2.44 ± 0.581.76 ± 0.92<.001
Venous segment
    Superficial (sub)2.94 ± 0.242.96 ± 0.20.650
    Superficial (unsub)2.98 ± 0.142.96 ± 0.2.562
Artifactual degradation
    Deep (sub)2.80 ± 0.42.60 ± 0.53.037
    Deep (unsub)2.92 ± 0.272.74 ± 0.44.016
    Subtracted2.78 ± 0.552.74 ± 0.53.781
    Unsubtracted2.82 ± 0.442.74 ± 0.53.473
Subtractionb
    Subtraction0.98 ± 0.140.92 ± 0.27.172

  • Note:—All values are reported as mean ± standard deviation; 0 indicates nondiagnostic; 1, diagnosis possible but limited; 2, good; 3, excellent; sub, unsub, subtracted and nonsubtracted.

  • ↵a Qualitative designation of diagnostic quality derived from 4-point scale (see text).

  • ↵b Indicates percentage of cases for which background subtraction was satisfactory.